Superconductivity pairing mechanism in the Holstein model
ORAL
Abstract
Superconductivity driven by electron-phonon coupling (EPC) has been widely studied, but the potential for unconventional pairing, such as d-wave, remains debated. We perform determinant quantum Monte Carlo simulations of the Holstein model to systematically explore the potential of d-wave superconductivity across a wide range of parameters including temperature, EPC strength, and phonon frequency. We find that s-wave superconductivity dominates across all parameters. While we observe a nonzero d-wave pair-field susceptibility in the simulations, it primarily stems from van Hove singularities in the non-interacting band structure. Furthermore, increasing the vertex correction suppresses, rather than enhances, the d-wave susceptibility, underscoring the robustness of s-wave pairing in this model.
*Funding and acknowledgment: This work is support by the U.S. Department of Energy (DOE), Basic Energy Sciences, Division of Materials Sciences and Engineering. Z.Z. is also supported by a Stanford Science fellowship. Computational work was performed on the Sherlock cluster. We would like to thank Stanford University and the Stanford Research Computing Center for providing computational resources and support that contributed to these research results.
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Presenters
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Thomas P Devereaux
- Stanford University